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Finding the Fourth Proportional to 663.40, 994.20 and 443.40

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Solution

The fourth proportional to 663.40, 994.20 and 443.40 is: 664.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.40 : 994.20 = 443.40 : x
  2. Step 2: Convert to fraction form
    663.40/994.20 = 443.40/x
  3. Step 3: Cross multiply
    663.40x = 994.20 × 443.40
  4. Step 4: Simplify right side
    663.40x = 440,828.28
  5. Step 5: Solve for x
    x = 440,828.28/663.40
  6. Step 6: Final answer
    x = 664.50

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.